The whole dashes debacle never made any sense, because many people are aware if you press and hold the hyphen "button" on your mobile touchscreen, it presents you options with different lengths you can choose from. That it was ever used as a signifier of LLM-written text meant that it can only show a false positive. For the last 20 or so years, a lot of web designers and content creators were "trained" on Elements of Style and other "best practices" cookbooks. People knew when to use what type of dash through these sources, as it gave a bit more of an elegant look to the presentation.